Can You Recommend Good Books with More In-Depth Information and Ideas?

Questions about good books on Christian apologetics, philosophy, and theology with more in-depth information and ideas, and resources to help an intellectually-inclined person with spiritual formation and developing the non-cerebral side of living a Christian life.  

• As a high school student, I have read many baseline books on Christian apologetics, theology, and philosophy, so could you recommend good books with more in-depth information and ideas?
• As someone with a passion for intellectual pursuits such as apologetics, theology, and philosophy, what resources might be helpful for spiritual formation and developing the non-cerebral side of living a Christian life?